I have a 2014 Freightliner Cascadia and the check engine…

For 2011 models, this code sets when the vehicle has been driven for 30 miles while a code is present for the DEF tank level, DEF metering valve, DEF pump, NOx sensors, Blocked DEF line, DEF quality, NOx efficiency, SCR harness and/or SCR sensor.

For 2010 models, this code sets when the vehicle has been driven for 10 hours or 500 miles while a code is present for the DEF tank level, DEF metering valve, DEF pump, NOx sensors, Blocked DEF line, DEF quality, NOx efficiency, SCR harness and/or SCR sensor.

SPN 4364/FMI 1 - EPA10 Selective Catalyst Reduction NOx Conversion Very Low Table 1. SPN 4364/FMI 1 Description This fault code sets when the Aftertreatment Control Module (ACM) detects that the NOx conversion is lower than a calibrated threshold Monitored Parameter Selective Catalyst Reduction (SCR) Inlet NOx sensor, SCR outlet NOx sensor Typical Enabling Conditions Diesel Exhaust Fluid (DEF) dosing enabled, 1000 - 1500 rpm, 15 - 100% load, SCR inlet temperature sensor less than 650°C (1200°F), ambient temperature greater than 0°C (32°F), coolant temperature greater than 70°C (158°F), non-regeneration conditions present Monitor Sequence None Execution Frequency Continuous when enabling conditions met Typical Duration 30 Minutes Dash Lamps MIL Engine Reaction Derate 25% Verification Parked Regeneration 1. Connect DiagnosticLink ®. 2. Turn the ignition ON (key ON, engine OFF). 3. Was another emission component-related fault code repaired prior to this step? a. Yes; perform a parked regeneration and recheck for the fault code. If the fault code returns, Go to step 4. b. No; Go to step 4. 4. Check for other fault codes. Are there any air management system (ITV, IMP, IAT, turbocharger etc.) fault codes present? a. Yes; diagnose the other fault codes first. b. No; Go to step 5. 5. Are there any Exhaust Gas Recirculation (EGR) system fault codes present? a. Yes; diagnose the other fault codes first. b. No; Go to step 6. 6. Are there any other NOx sensor fault codes present? a. Yes; diagnose the other fault codes first. b. No; Go to step 7. 7. Are there any fault codes for the DEF doser, DEF pump, or DEF air valve present? a. Yes; diagnose the other fault codes first. b. No; Go to step 8. 8. Turn the ignition OFF. 9. Using a refractometer from the DEF Test Kit W060589001900, measure the DEF percentage. Refer to section "Checking Diesel Exhaust Fluid Quality". Is DEF percentage between 28% and 36%? a. Yes; Go to step 10. b. No; flush the DEF system. Refer to section "Flushing of the Diesel Exhaust Fluid System". Verify repair. 10. Turn the ignition ON (key ON, engine OFF). 11. Compare the DEF pressure sensor reading to the barometric pressure sensor reading. Are the readings within 4.3 psi of each other? a. Yes; Go to step 12. b. No; replace the DEF pressure sensor. Refer to section "Removal of the Diesel Exhaust Fluid Pressure Sensor". Verify repair. 2 SPN 4364/FMI 1 - EPA10 4 All information subject to change without notice. Copyright © 2014 DETROIT DIESEL CORPORATION 8 08-14 12. Perform the DEF quantity service routine. Refer to section "Diesel Exhaust Fluid Quantity Test - EPA10". Does the DEF quantity test complete successfully? a. Yes; Go to step 13. b. No; flush the DEF metering unit. Verify repair. WARNING: ENGINE EXHAUST To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic. WARNING: HOT EXHAUST During parked regeneration the exhaust gases will be extremely HOT and could cause a fire if directed at combustible materials. The vehicle must be parked outside. WARNING: PERSONAL INJURY To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked. 13. Start the engine and perform a parked regeneration. 14. Shut the engine OFF. NOTE: SPN 3361/FMI 5 will set when the DEF dosing valve electrical connector is disconnected. The fault code can be cleared using DiagnosticLink after the DEF dosing valve electrical connector is reconnected. 15. Disconnect the DEF dosing valve electrical connector. WARNING: ENGINE EXHAUST To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic. WARNING: HOT EXHAUST During parked regeneration the exhaust gases will be extremely HOT and could cause a fire if directed at combustible materials. The vehicle must be parked outside. WARNING: PERSONAL INJURY To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked. 16. Start the engine. 17. Run the EPA10 Perform Performance Check - Low Temperature ATD procedure. Refer to section "EPA10 Perform Performance Check - Low Temperature ATD". Are the NOx inlet sensor and the NOx outlet sensor readings within 50 ppm/15% of each other? a. Yes; Go to step 18. b. No; reconnect the DEF dosing valve electrical connector and replace the NOx sensor that is out of specification. Verify repair. 18. Reconnect the DEF dosing valve electrical connector. 19. Perform a parked regeneration while monitoring the NOx efficiency. Is the NOx efficiency above 70%? 8 08-14 All information subject to change without notice. 5 8 08-14 Copyright © 2014 DETROIT DIESEL CORPORATION a. Yes; this fault was likely caused by the DEF build-up in the exhaust which was cleared by the parked regeneration procedures. Release the vehicle. b. No; Use DiagnosticLink to perform the DOC face plug routine to clear the DEF build-up in the exhaust. 2 SPN 4364/FMI 1 - EPA10 6 All information subject to change without notice. Copyright © 2014 DETROIT DIESEL CORPORATION 8 08-14 3 SPN 4364/FMI 18 - EPA10 Selective Catalyst Reduction NOx Conversion Low Table 2. SPN 4364/FMI 18 Description This fault code sets when the Aftertreatment Control Module (ACM) detects that the NOx conversion is lower than a calibrated threshold Monitored Parameter Selective Catalyst Reduction (SCR) Inlet NOx sensor, SCR outlet NOx sensor Typical Enabling Conditions Diesel Exhaust Fluid (DEF) dosing enabled, 1000 - 1500 rpm, 15 - 100% load, SCR inlet temperature sensor less than 650°C (1200°F), ambient temperature greater than 0°C (32°F), coolant temperature greater than 70°C (158°F), non-regeneration conditions present Monitor Sequence None Execution Frequency Continuous when enabling conditions met Typical Duration 30 Minutes Dash Lamps MIL Engine Reaction Derate 25% Verification Parked Regeneration 1. Connect DiagnosticLink ®. 2. Turn the ignition ON (key ON, engine OFF). 3. Was another emission component-related fault code repaired prior to this step? a. Yes; perform a parked regeneration and recheck for the fault code. If the fault code returns, Go to step 4. b. No; Go to step 4. 4. Check for other fault codes. Are there any air management system (ITV, IMP, IAT, turbocharger etc.) fault codes present? a. Yes; diagnose the other fault codes first. b. No; Go to step 5. 5. Are there any Exhaust Gas Recirculation (EGR) system fault codes present? a. Yes; diagnose the other fault codes first. b. No; Go to step 6. 6. Are there any other NOx sensor fault codes present? a. Yes; diagnose the other fault codes first. b. No; Go to step 7. 7. Are there any fault codes for the DEF doser, DEF pump, or DEF air valve present? a. Yes; diagnose the other fault codes first. b. No; Go to step 8. 8. Turn the ignition OFF. 9. Using a refractometer from the DEF Test Kit W060589001900, measure the DEF percentage. Refer to section "Checking Diesel Exhaust Fluid Quality". Is DEF percentage between 28% and 36%? a. Yes; Go to step 10. b. No; flush the DEF system. Refer to section "Flushing of the Diesel Exhaust Fluid System". Verify repair. 10. Turn the ignition ON (key ON, engine OFF). 11. Compare the DEF pressure sensor reading to the barometric pressure sensor reading. Are the readings within 4.3 psi of each other? a. Yes; Go to step 12. b. No; replace the DEF pressure sensor. Refer to section "Removal of the Diesel Exhaust Fluid Pressure Sensor". Verify repair. 8 08-14 All information subject to change without notice. 7 8 08-14 Copyright © 2014 DETROIT DIESEL CORPORATION 12. Perform the DEF quantity service routine. Refer to section "Diesel Exhaust Fluid Quantity Test - EPA10". Does the DEF quantity test complete successfully? a. Yes; Go to step 13. b. No; flush the DEF metering unit. Verify repair. WARNING: ENGINE EXHAUST To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic. WARNING: HOT EXHAUST During parked regeneration the exhaust gases will be extremely HOT and could cause a fire if directed at combustible materials. The vehicle must be parked outside. WARNING: PERSONAL INJURY To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked. 13. Start the engine and perform a parked regeneration. 14. Shut the engine OFF. NOTE: SPN 3361/FMI 5 will set when the DEF dosing valve electrical connector is disconnected. The fault code can be cleared using DiagnosticLink after the DEF dosing valve electrical connector is reconnected. 15. Disconnect the DEF dosing valve electrical connector. WARNING: ENGINE EXHAUST To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic. WARNING: HOT EXHAUST During parked regeneration the exhaust gases will be extremely HOT and could cause a fire if directed at combustible materials. The vehicle must be parked outside. WARNING: PERSONAL INJURY To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked. 16. Start the engine. 17. Run the EPA10 Perform Performance Check - Low Temperature ATD procedure. Refer to section "EPA10 Perform Performance Check - Low Temperature ATD". Are the NOx inlet sensor and the NOx outlet sensor readings within 50 ppm/15% of each other? a. Yes; Go to step 18. b. No; reconnect the DEF dosing valve electrical connector and replace the NOx sensor that is out of specification. Verify repair. 18. Reconnect the DEF dosing valve electrical connector. 19. Perform a parked regeneration while monitoring the NOx efficiency. Is the NOx efficiency above 70%? 3 SPN 4364/FMI 18 - EPA10 8 All information subject to change without notice. Copyright © 2014 DETROIT DIESEL CORPORATION 8 08-14 a. Yes; this fault was likely caused by the DEF build-up in the exhaust which was cleared by the parked regeneration procedures. Release the vehicle. b. No; Use DiagnosticLink to perform the DOC face plug routine to clear the DEF build-up in the exhaust.

SPN 5246/FMI 15

DescriptionRegulatory Fault Ignored - Derate On.

Monitored ParameterSCR and DPF sensors

Typical Enabling ConditionsAlways enabled

Monitor SequenceNone

Execution FrequencyAlways enabled

Typical Duration2 seconds

Dash LampsCEL

Engine Reaction25 percent derate

Verification

Parked SCR efficiency test for extended SCR faults

High idle regeneration for DPF and NOx faults

Check as follows:

Show/Hide Checkboxes

1. Connect DiagnosticLink® . Go to step 2.
2. Check for other emission-related fault codes. Are there any Selective Catalyst Reduction (SCR) or Diesel Particulate Filter (DPF) related fault codes present?
   1. Yes; diagnose and repair the emission-related fault codes first. Verify repair.
   2. No; perform the Selective Catalyst Reduction (SCR) efficiency test or high idle regeneration. Use DiagnosticLink to clear the code.

Sorry to hear you're having these troubles with this truck. The 5246 code is basically an indicator for a fault within your aftertreatment system.

SPN 3364/FMI 2 - GHG14

Improper Diesel Exhaust Fluid Quality

SPN 3364/FMI 2

DescriptionImproper Diesel Exhaust Fluid (DEF) Quality

Monitored ParameterDEF Quality

Typical Enabling ConditionsDEF Refill Event Detected

Monitor SequenceNone

Execution FrequencyContinuous When Enabling Conditions Met

Typical DurationTwo hours

Dash LampsMIL, CEL, DEF Lamp Flash

Engine ReactionNone

VerificationParked Regeneration

Check as follows:

NOTE: Retain a log file if Detroit™ Customer Assistance is required.

Show/Hide Checkboxes

ENGINE EXHAUST
To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic.

PERSONAL INJURY
To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.

HOT EXHAUST
During parked regeneration the exhaust gases will be extremely HOT and could cause a fire if directed at combustible materials. The vehicle must be parked outside.

NOTICE:

Running engine with DEF Dosing Unit disconnected will induce faults.

NOTICE:

Do not attempt to operate engine with the DEF lines disconnected. DEF pump runs and circulates DEF through the system at a limited rate (default) to aid in system cooling.

NOTE: NOx Inlet normal reading should be 0 to 50 ppm higher than the NOx Outlet reading.

ENGINE EXHAUST
To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic.

PERSONAL INJURY
To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.

HOT EXHAUST
During parked regeneration the exhaust gases will be extremely HOT and could cause a fire if directed at combustible materials. The vehicle must be parked outside.

1. Was another emission component-related fault code repaired prior to this step?
   1. Yes; perform a parked regeneration to verify repairs and clear fault codes.
   2. No; Go to step 2.
2. Use DEF test strip A0005850202 to check for diesel fuel or oil contamination of the DEF fluid; Refer to section "Checking Diesel Exhaust Fluid Quality" . Does the test strip or visual inspection indicate that the DEF is contaminated?
   1. Yes; for diesel fuel or oil contamination, refer to 13 TS-17 and refer to appropriate Original Equipment Manufacturer (OEM) literature for DEF tank cleaning/flushing procedures. Verify repair.
   2. No; Go to step 3.
3. Using a refractometer from the DEF Test Kit W060589001900, measure the DEF percentage. Is DEF percentage between 31 to 34%?
   1. Yes; Go to step 4.
   2. No; clean/flush the DEF tank, then Go to step 7. Refer to section "Flushing of the GHG14 Diesel Exhaust Fluid System" .
4. Turn ignition ON (key ON, engine OFF).
5. Visually check all DEF lines for physical damage (kinks, cracks, leaks and disconnects). Is any damage found?
   1. Yes; repair as necessary, Go to step 7.
   2. No;Go to step 6.
6. Unbolt DEF Dosing Unit from exhaust only. Do not disconnect DEF hoses or electrical connector. Refer to section "Removal of the GHG14 Dosing System Doser" .
7. Perform a DEF Quantity Test service routine and record the amount of DEF fluid level dispensed. Is the dispensed DEF fluid level between 108 to 132 mL (3.65 and 4.46 ounces)?
   1. Yes; reinstall DEF Dosing Unit. Go to step 8.
   2. No; replace DEF Dosing Unit. To verify repairs, Go to step 8.
8. Connect DiagnosticLink® . Monitor (chart) the following parameters.
   • ASL102 Engine Speed
   • AS018 Selective Catalyst Reduction (SCR) Inlet Temperature
   • AS019 SCR Outlet Temperature
   • AS035 SCR Inlet NOx sensor
   • AS036 SCR Outlet NOx sensor
   • AS101 NOx Conversion Efficiency
9. Start engine and perform a parked regeneration. Does the NOx conversion efficiency rise and stay above 85% (0.85) during the regeneration? Check after the regeneration to ensure SPN 3364/FMI 2 and all SPN 5246/FMI (any) faults go inactive. Refer to section "Performing a Parked Regeneration - EPA10/GHG14" .
   1. Yes; clear faults and release vehicle.
   2. No;Go to step 10.
10. Disconnect the DEF Dosing Unit electrical connector only. Leave Dosing Unit bolted to Aftertreatment and DEF hoses intact.
11. Inspect the harness connector for signs of damaged, bent, spread, corroded or unseated (pushed out) pins and signs of moisture in the connector or wire damage near the connector. Is damage or contamination found?
    1. Yes; repair as necessary. Perform a parked regeneration to verify repairs. Refer to section "Performing a Parked Regeneration Using DiagnosticLink®" .
    2. No;Go to step 12.
12. Start engine and perform a "Perform Performance Check - Low Temp ATD". After thirty minutes, are the NOx sensor values within 50 ppm of each other?
    1. Yes; Go to step 13.
    2. No; replace the Inlet NOx sensor. Perform a parked regeneration to verify repairs. Refer to section "Performing a Parked Regeneration Using DiagnosticLink®" .
13. Turn the ignition OFF.
14. Disconnect the Aftertreatment Control Module (ACM) 120-pin connector.
15. Inspect the ACM 120-pin connector and the 120-pin harness connector for signs of corrosion, spread, unseated (pushed out) or damaged pins, connector seal for damage (signs of water or oil intrusion) or signs of wire damage. Is damage or contamination found?
    1. Yes; repair as necessary. Perform a parked regeneration to verify repairs. Refer to section "Performing a Parked Regeneration Using DiagnosticLink®" .
    2. No;Go to step 16.
16. Install a test ACM. Perform a parked regeneration to verify repairs. Refer to section "Performing a Parked Regeneration Using DiagnosticLink®" .